tabularray 保持其内容的中间垂直对齐

Question

我想知道在主表格中的以下示例中强制中间垂直对齐的原因是什么。内部表格没有问题，但外部表格不遵守行中定义的不同对齐方式colspec = {Q[l,t] Q[r,b]}。

谢谢

\documentclass{article}
\usepackage{tikz}
\usepackage{tabularray}

\NewDocumentEnvironment{mathtask}{+b}{%
    \begin{tblr}{
        colspec={Q[r,b,1cm] Q[c,b,1cm] Q[l,mode=math,1cm]},
        vlines,hlines,
    }
    #1
\end{tblr}}{}


\begin{document}

\centering%
\begin{tblr}{
        vlines, hlines,
        columns = {0.5\textwidth-13pt, colsep=6pt},
        rows    = {4cm, rowsep=2pt},
        colspec = {Q[l,t] Q[r,b]},
    }
    \begin{mathtask}
        {aaa\\bbb\\ccc\\ddd} & {xx\\yy} & c
    \end{mathtask}
    &
    \begin{mathtask}
        {aaa\\bbb} & xxxx & d
    \end{mathtask}
    \\
    \begin{mathtask}
        {aaa\\bbb\\ccc\\ddd\\eee\\ff} & {xx\\yy} & e
    \end{mathtask}
    &
    \begin{mathtask}
        {aaa\\bbb\\ccc} & {xx\\yy} & f
    \end{mathtask}
\end{tblr}

\end{document}

---

编辑。 原始问题。

\documentclass{article}
\usepackage{mathtools}
\usepackage{tikz}
\usepackage{tabularray}
\usepackage[showframe]{geometry}

\newlength{\cwidth}  \setlength{\cwidth}{0.49\textwidth}
\newlength{\cheight} \setlength{\cheight}{0.49\textheight}

\newcommand\tasknumber[1]{%
    \begin{tikzpicture}[
            inner sep=0pt,outer sep=0pt, minimum size=21pt,
            baseline={([yshift=-3pt]current bounding box.center)},
        ]
        \node [draw,circle,color=white,fill=white!45!black,] {#1};
    \end{tikzpicture}}
\setlength{\tabcolsep}{3pt}

\NewDocumentEnvironment{mathtask}{+b}{%
    \begin{tblr}{
        colspec={l l l},
        column{2}={font=\bfseries},
        column{3}={mode=math},
        columns={colsep=3pt},
    }
    #1
    \end{tblr}
}{}

\pagestyle{empty}



\begin{document}

\centering
\begin{tblr}{
        colspec={l l},
        columns={\cwidth-3pt, colsep=3pt},
        rows={\cheight, rowsep=3pt},
        vline{2} = solid,
        hline{2} = solid,
    }
    \begin{mathtask}
        \tasknumber{1} &
        Solve the system: &
        \begin{cases}
            x + y + = 1 \\
            x + y + = 1 \\
            x + y + = 1 \\
            x + y + = 1 \\
            x + y + z = 2
        \end{cases}
    \end{mathtask}
    &
    \begin{mathtask}
        \tasknumber{2} &
        Solve the system: &
        \begin{cases}
            x + y + = 1 \\
            x + y + = 3 \\
            x + y + z = 2
        \end{cases}
    \end{mathtask}
    \\
    \begin{mathtask}
        \tasknumber{3} &
        Solve the equation: &
        x + y + z = 2
    \end{mathtask}
    &
    \begin{mathtask}
        \tasknumber{50} &
        Solve the system: &
        \begin{cases}
            x + y + = 1 \\
            x + y + z = 2
        \end{cases}
    \end{mathtask}
\end{tblr}

\end{document}

Answer 1

当每个单元格一行只有一行文本时，垂直对齐选项t/ m/b对于此行是相同的。对于传统的tabular（除了仍然有一个对齐漏洞在tabular环境中）。

虽然mathtask环境由一个复杂的表格组成，但 TeX 仍然将其视为一个框，因此这些单元格都是单行的（你可以在环境前后添加一些文本来更清楚地看到它mathtask）。因此在外部表格中，例如colspec={Q[t]Q[b]}和colspec={Q[b]Q[m]}和colspec={Q[m]Q[t]}将产生相同的结果。

我不确定你真正想从代码中得到什么。但你可以更改内部表的对齐方式：

\documentclass{article}

\usepackage{tabularray}
\NewDocumentEnvironment{mathtask}{O{}+b}{%
    \begin{tblr}[T]{
        colspec={Q[r,#1,1cm] Q[c,#1,1cm] Q[l,mode=math,1cm]},
        vlines,hlines,
    }
    #2
\end{tblr}}{}

\begin{document}

\centering
\begin{tblr}{
        vlines, hlines,
        columns = {0.5\textwidth-13pt, colsep=6pt},
        rows    = {4cm, rowsep=2pt},
        colspec = {Q[l,t] Q[r,b]},
    }
    a\begin{mathtask}[t]
        {aaa\\bbb\\ccc\\ddd} & {xx\\yy} & c
    \end{mathtask}b
    &
    a\begin{mathtask}[t]
        {aaa\\bbb} & xxxx & d
    \end{mathtask}b
    \\
    a\begin{mathtask}[b]
        {aaa\\bbb\\ccc\\ddd\\eee\\ff} & {xx\\yy} & e
    \end{mathtask}b
    &
    a\begin{mathtask}[b]
        {aaa\\bbb\\ccc} & {xx\\yy} & f
    \end{mathtask}b
\end{tblr}

\end{document}

---

编辑：对于您的原始问题，您需要移出\tasknumber这些新列mathtask并设置垂直对齐方式：h

\documentclass{article}
\usepackage{mathtools}
\usepackage{tikz}
\usepackage{tabularray}
\usepackage[showframe]{geometry}

\newlength{\cheight} \setlength{\cheight}{0.5\textheight-6.02pt}

\newcommand\tasknumber[1]{%
    \begin{tikzpicture}[
            inner sep=0pt,outer sep=0pt, minimum size=21pt,
            baseline={([yshift=-3pt]current bounding box.center)},
        ]
        \node [draw,circle,color=white,fill=white!45!black,] {#1};
    \end{tikzpicture}}
\setlength{\tabcolsep}{3pt}

\NewDocumentEnvironment{mathtask}{+b}{%
    \begin{tblr}{
        colspec={ll},
        column{1}={font=\bfseries},
        column{2}={mode=math},
        columns={colsep=3pt},
    }
    #1
    \end{tblr}
}{}

\pagestyle{empty}

\begin{document}

\centering
\begin{tblr}{
        colspec={Q[h,l]X[l]Q[h,l]X[l]},
        colsep=3pt,
        rows={\cheight, rowsep=3pt},
        vline{3} = solid,
        hline{2} = solid,
    }
    \tasknumber{1} &
    \begin{mathtask}
        Solve the system: &
        \begin{cases}
            x + y + = 1 \\
            x + y + = 1 \\
            x + y + = 1 \\
            x + y + = 1 \\
            x + y + z = 2
        \end{cases}
    \end{mathtask}
    &
    \tasknumber{2} &
    \begin{mathtask}
        Solve the system: &
        \begin{cases}
            x + y + = 1 \\
            x + y + = 3 \\
            x + y + z = 2
        \end{cases}
    \end{mathtask}
    \\
    \tasknumber{3} &
    \begin{mathtask}
        Solve the equation: &
        x + y + z = 2
    \end{mathtask}
    &
    \tasknumber{50} &
    \begin{mathtask}
        Solve the system: &
        \begin{cases}
            x + y + = 1 \\
            x + y + z = 2
        \end{cases}
    \end{mathtask}
\end{tblr}

\end{document}